Permeability and Epidermal Transport

Gomme, Jørgen

doi:10.1007/978-3-642-51593-4_20

Cited by 7 publications

(1 citation statement)

References 156 publications

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“…The sensory stimuli may easily diffuse through these covers. In Sipuncula and Annelida, the cuticle is similar in structure and most likely has corresponding qualities (Gomme 1984;Richards 1984;Storch 1988;Rice 1993). Therefore, it might be permeable to various substances in Sipuncula as well.…”

Section: Nuchal Organmentioning

confidence: 99%

Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae)

1997

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The ultrastructure of the nuchal organ and cerebral organ is described for the first time in a species of the Sipuncula, Onchnesoma squamatum. The nuchal organ is an unpaired structure lying outside and dorsal to the tentacular crown; furrows give the organ a paired appearance. The cerebral organ is an unciliated pad anterior to the nuchal organ. The nuchal organ consists of ciliated supporting cells, non-ciliated supporting cells and bipolar primary sensory cells. The cerebral organ is composed of unciliated supporting cells and numerous bipolar sensory cells. This clearly favours the hypothesis that this structure has a sensory function in adults rather than being a vestige of a larval organ. The sensory cells are similar in both organs and exhibit features indicative of chemoreception. Since the density of the sensory cells is low in the nuchal organ, an exclusively sensory function is questioned. There is some evidence that the two organs represent a functional unit. The present findings do not support the view that the nuchal organs of Sipuncula and "Polychaeta" are homologous, but instead suggest that they are convergent structures.& b d y :

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Section: Nuchal Organmentioning

confidence: 99%

Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae)

1997

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Transport of exogenous organic substances by invertebrate integuments: The field revisited

Gomme

2001

J. Exp. Zool.

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The notion that some marine invertebrates can use integumental uptake of organic compounds as a nutritional supplement dates back to the late 19th and early 20th centuries. This article provides a brief overview of more than a century’s research, as it relates to significant stages in the development of experimental methods and concepts of general physiology. Emphasis is placed on changing paradigms and on the interplay between this specialized field of investigation and the mainstream of physiological thought. The present status of the field is summarized. The general consensus is challenged on the basis of previously published and new data from the author’s laboratory. Particular emphasis is placed on data pointing toward an ultra‐rapid turnover of amino acids in part of the epidermal space of the polychaete worm Nereis diversicolor. It is suggested that intra‐epidermal L‐alanine is compartmentalized metabolically or physically, and the consequences of this proposition are discussed in view of the general concepts of secondary active transport and intracellular isosmotic regulation. Future studies in this area of comparative physiology should concentrate not only on the molecular characteristics of the transporter proteins, but also on the way their function is integrated in the cellular physiology of the transporting cells. J. Exp. Zool. 289:254–265, 2001. © 2001 Wiley‐Liss, Inc.

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Nutrient Absorption in Invertebrates

Wright

Ahearn

1997

Comprehensive Physiology

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Permeability and Epidermal Transport

Cited by 7 publications

References 156 publications

Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae)

Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae)

Transport of exogenous organic substances by invertebrate integuments: The field revisited

Nutrient Absorption in Invertebrates

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